Abstract
Objective: To evaluate the effect of glide path creation on transportation promoted by NiTi and M-Wire instruments. Material and Methods: Sixty polyester resin blocks containing a simulated root canal were distributed into four groups (n=15), according to the protocols/systems used for root canal preparation: GPR group - glide path + Revo-S system; R group - no glide path + Revo-S system; GPPN group - glide path + ProTaper Next system and PN group - no glide path + ProTaper Next system. Root canals were photographed before and after preparation, and the images were superimposed to evaluate the transportation at the apical, middle and coronal thirds. The time spent to perform preparation was also measured (seconds). Data were submitted to the non-parametric Kruskal-Wallis test (p<0.05) for statistical analysis. Results: In the apical third, there was no significant difference among groups (p>0.05). GPR and R groups were similar in the middle third (p>0.05). However, the transportation value in GPR group was statistically higher in comparison with GPPN and PN groups (p<0.05). In the coronal third, GPR and R groups were similar (p>0.05). Only R group presented significant difference in comparison with GPPN and PN groups (p<0.05). There was no difference among groups about time spent to perform preparation (p>0.05). Conclusion: None of the systems were capable of maintaining the original trajectory of the simulated root canal, and the glide path had no effect on the transportation promoted by instruments.KeywordsDental instruments; Endodontics; Root canal preparation.
Highlights
Biomechanical preparation is one of the most critical stages of endodontic therapy [1]
GPR group presented transportation values statistically higher in comparison with GPPN and PN groups (p0.05)
R group had a significant difference in comparison with GPPN and PN groups (p
Summary
Biomechanical preparation is one of the most critical stages of endodontic therapy [1]. New systems for biomechanical preparation, such as those manufactured with M-Wire technology, have increased the flexibility and resistance to cyclic and torsional fatigue of instruments, in comparison with the conventional NiTi instruments [6]. M-Wire instruments undergo a thermomechanical treatment, in which the martensistic phase of the NiTi alloy is transformed into the austenitic phase, followed by reversion to martensitic phase after stress removal [6]. This manufacturing process gives to the instruments superelasticity, allowing preparation of root canals of different anatomical complexities [6]
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